Configuration Notes for Ubuntu 18.04

Personal notes on changes in Ubuntu versions that caught my attention.

Changing the Hostname

# hostnamectl set-hostname sv1.example.jp

Setting up iptables

With netplan, it doesn’t work well with if-pre-up.d? Using iptables-persistent works well.

# apt install iptables-persistent
# <configure iptables>
# iptables-save > /etc/iptables/rules.v4
# ip6tables-save > /etc/iptables/rules.v6

Configuring netplan

Place the file in yaml format in /etc/netplan/*.yaml

network:
    ethernets:
        ens3:
            addresses:
            - 192.168.0.2/24
            gateway4: 192.168.0.1
            nameservers:
                addresses:
                - 8.8.8.8
                - 8.8.4.4
                search: []
            optional: true
    version: 2

Applying the configuration

# netplan --debug generate
# netplan apply